Premiere Pro 13.1.4 includes all of the improvements from 13.1.3 with an additional bug fix that addresses a launch issue for some Windows systems with outdated drivers.

The 13.1.3 update for Premiere Pro includes the following enhancements:

Better HEVC performance on Mac

Multichannel audio mixing improvements allowing for up/down mixing of 5.1 <-> stereo using the Channel Mixer effect. For more information, see Audio effects and transitions.

More flexibility for caption file exports

Graphics layers are now in the same order in the Essential Graphics panel and the Effects Control panel

Warp stabilizer improvements that make it easy to clean up handheld footage from different cameras or fine-tune camera shake to match your creative intent. Comprehensive refinements make the Warp Stabilizer workflow more powerful and much faster.

This release of Premiere Pro removes support for importing MKV formats.

Premiere Pro 13.1.3 also fixes a critical issue with AAF exports from Premiere Pro where some source media associated with XMP may be deleted after rendering. This issue only occurs in versions 13.1, 13.1.1 and 13.1.2 of Premiere Pro. For information on known issues and other bugs fixed in this release, see:

HEVC playback on Windows is smoother with new 10-bit hardware decoding. This release also includes hardware decoding improvements for H.264 and HEVC on macOS. RED footage plays better with new RED Metal acceleration.